12,947 research outputs found
From Sensors Data to Urban Traffic Flow Analysis
By 2050, almost 70% of the population will live in cities. As the population grows, travel demand increases and this might affect air quality in urban areas. Traffic is among the main sources of pollution within cities. Therefore, monitoring urban traffic means not only identifying congestion and managing accidents but also preventing the impact on air pollution. Urban traffic modeling and analysis is part of the advanced traffic intelligent management technologies that has become a crucial sector for smart cities. Its main purpose is to predict congestion states of a specific urban transport network and propose improvements in the traffic network that might result into a decrease of the travel times, air pollution and fuel consumption. This paper describes the implementation of an urban traffic flow model in the city of Modena based on real traffic sensor data. This is part of a wide European project that aims at studying the correlation among traffic and air pollution, therefore at combining traffic and air pollution simulations for testing various urban scenarios and raising citizen awareness about air quality where necessary
A Survey of Data Fusion in Smart City Applications
The advancement of various research sectors such as Internet of Things (IoT),
Machine Learning, Data Mining, Big Data, and Communication Technology has shed
some light in transforming an urban city integrating the aforementioned
techniques to a commonly known term - Smart City. With the emergence of smart
city, plethora of data sources have been made available for wide variety of
applications. The common technique for handling multiple data sources is data
fusion, where it improves data output quality or extracts knowledge from the
raw data. In order to cater evergrowing highly complicated applications,
studies in smart city have to utilize data from various sources and evaluate
their performance based on multiple aspects. To this end, we introduce a
multi-perspectives classification of the data fusion to evaluate the smart city
applications. Moreover, we applied the proposed multi-perspectives
classification to evaluate selected applications in each domain of the smart
city. We conclude the paper by discussing potential future direction and
challenges of data fusion integration.Comment: Accepted and To be published in Elsevier Information Fusio
SONYC: A System for the Monitoring, Analysis and Mitigation of Urban Noise Pollution
We present the Sounds of New York City (SONYC) project, a smart cities
initiative focused on developing a cyber-physical system for the monitoring,
analysis and mitigation of urban noise pollution. Noise pollution is one of the
topmost quality of life issues for urban residents in the U.S. with proven
effects on health, education, the economy, and the environment. Yet, most
cities lack the resources to continuously monitor noise and understand the
contribution of individual sources, the tools to analyze patterns of noise
pollution at city-scale, and the means to empower city agencies to take
effective, data-driven action for noise mitigation. The SONYC project advances
novel technological and socio-technical solutions that help address these
needs.
SONYC includes a distributed network of both sensors and people for
large-scale noise monitoring. The sensors use low-cost, low-power technology,
and cutting-edge machine listening techniques, to produce calibrated acoustic
measurements and recognize individual sound sources in real time. Citizen
science methods are used to help urban residents connect to city agencies and
each other, understand their noise footprint, and facilitate reporting and
self-regulation. Crucially, SONYC utilizes big data solutions to analyze,
retrieve and visualize information from sensors and citizens, creating a
comprehensive acoustic model of the city that can be used to identify
significant patterns of noise pollution. These data can be used to drive the
strategic application of noise code enforcement by city agencies to optimize
the reduction of noise pollution. The entire system, integrating cyber,
physical and social infrastructure, forms a closed loop of continuous sensing,
analysis and actuation on the environment.
SONYC provides a blueprint for the mitigation of noise pollution that can
potentially be applied to other cities in the US and abroad.Comment: Accepted May 2018, Communications of the ACM. This is the author's
version of the work. It is posted here for your personal use. Not for
redistribution. The definitive Version of Record will be published in
Communications of the AC
Deep-MAPS: Machine Learning based Mobile Air Pollution Sensing
Mobile and ubiquitous sensing of urban air quality has received increased
attention as an economically and operationally viable means to survey
atmospheric environment with high spatial-temporal resolution. This paper
proposes a machine learning based mobile air pollution sensing framework,
called Deep-MAPS, and demonstrates its scientific and financial values in the
following aspects. (1) Based on a network of fixed and mobile air quality
sensors, we perform spatial inference of PM2.5 concentrations in Beijing (3,025
km2, 19 Jun-16 Jul 2018) for a spatial-temporal resolution of 1km-by-1km and 1
hour, with over 85% accuracy. (2) We leverage urban big data to generate
insights regarding the potential cause of pollution, which facilitates
evidence-based sustainable urban management. (3) To achieve such
spatial-temporal coverage and accuracy, Deep-MAPS can save up to 90% hardware
investment, compared with ubiquitous sensing that relies primarily on fixed
sensors.Comment: 10 pages, 4 figures, 1 tabl
Urban lighting project for a small town: comparing citizens and authority benefits
The smart and resilient city evolves by slow procedures of mutation without radical changes, increasing the livability of its territory. The value of the city center in a Smart City can increase through urban lighting systems: its elements on the territory can collect and convey data to increase services to city users; the electrical system becomes the so-called Smart Grid. This paper presents a study of smart lighting for a small town, a touristic location inside a nature reserve on the Italian coast. Three different approaches have been proposed, from minimal to more invasive interventions, and their effect on the territory has been investigated. Based on street typology and its surroundings, the work analyzes the opportunity to introduce smart and useful services for the citizens starting from a retrofitting intervention. Smart city capabilities are examined, showing how it is possible to provide new services to the cities through ICT (Information and Communication Technology) without deep changes and simplifying the control of basic city functions. The results evidence an important impact on annual energy costs, suggesting smart grid planning not only for metropolis applications, but also in smaller towns, such as the examined one
Bayesian Particle Tracking of Traffic Flows
We develop a Bayesian particle filter for tracking traffic flows that is
capable of capturing non-linearities and discontinuities present in flow
dynamics. Our model includes a hidden state variable that captures sudden
regime shifts between traffic free flow, breakdown and recovery. We develop an
efficient particle learning algorithm for real time on-line inference of states
and parameters. This requires a two step approach, first, resampling the
current particles, with a mixture predictive distribution and second,
propagation of states using the conditional posterior distribution. Particle
learning of parameters follows from updating recursions for conditional
sufficient statistics. To illustrate our methodology, we analyze measurements
of daily traffic flow from the Illinois interstate I-55 highway system. We
demonstrate how our filter can be used to inference the change of traffic flow
regime on a highway road segment based on a measurement from freeway
single-loop detectors. Finally, we conclude with directions for future
research
A Comparative Study of Various Routing Protocols in VANET
Vehicular Ad Hoc Networks (VANET) is a subclass of Mobile ad hoc networks
which provides a distinguished approach for Intelligent Transport System (ITS).
The survey of routing protocols in VANET is important and necessary for smart
ITS. This paper discusses the advantages / disadvantages and the applications
of various routing protocols for vehicular ad hoc networks. It explores the
motivation behind the designed, and traces the evolution of these routing
protocols. F inally the paper concludes by a tabular comparison of the various
routing protocols for VANET.Comment: 6 pages, 1 figure and 2 table
Towards Smarter Management of Overtourism in Historic Centres Through Visitor-Flow Monitoring
Historic centres are highly regarded destinations for watching and even participating in diverse and unique forms of cultural expression. Cultural tourism, according to the World Tourism Organization (UNWTO), is an important and consolidated tourism sector and its strong growth is expected to continue over the coming years. Tourism, the much dreamt of redeemer for historic centres, also represents one of the main threats to heritage conservation: visitors can dynamize an economy, yet the rapid growth of tourism often has negative effects on both built heritage and the lives of local inhabitants. Knowledge of occupancy levels and flows of visiting tourists is key to the efficient management of tourism; the new technologies—the Internet of Things (IoT), big data, and geographic information systems (GIS)—when combined in interconnected networks represent a qualitative leap forward, compared to traditional methods of estimating locations and flows. A methodology is described in this paper for the management of tourism flows that is designed to promote sustainable tourism in historic centres through intelligent support mechanisms. As part of the Smart Heritage City (SHCITY) project, a collection system for visitors is developed. Following data collection via monitoring equipment, the analysis of a set of quantitative indicators yields information that can then be used to analyse visitor flows; enabling city managers to make management decisions when the tourism-carrying capacity is exceeded and gives way to overtourism.Funded by the Interreg Sudoe Programme of the European Regional Development Funds (ERDF
Vehicle to Vehicle (V2V) Communication for Collision Avoidance for Multi-Copters Flying in UTM -TCL4
NASAs UAS Traffic management (UTM) research initiative is aimed at identifying requirements for safe autonomous operations of UAS operating in dense urban environments. For complete autonomous operations vehicle to vehicle (V2V) communications has been identified as an essential tool. In this paper we simulate a complete urban operations in an high fidelity simulation environment. We design a V2V communication protocol and all the vehicles participating communicate over this system. We show how V2V communication can be used for finding feasible, collision-free paths for multi agent systems. Different collision avoidance schemes are explored and an end to end simulation study shows the use of V2V communication for UTM TCL4 deployment
Smarter Cities with Parked Cars as Roadside Units
Real-time monitoring of traffic density, road congestion, public
transportation, and parking availability are key to realizing the vision of a
smarter city and, with the advent of vehicular networking technologies such as
IEEE 802.11p and WAVE, this information can now be gathered directly from the
vehicles in an urban area. To act as a backbone to the network of moving
vehicles, collecting, aggregating, and disseminating their information, the use
of parked cars has been proposed as an alternative to costly deployments of
fixed Roadside Units.
In this paper, we introduce novel mechanisms for parking vehicles to
self-organize and form efficient vehicular support networks that provide
widespread coverage to a city. These mechanisms are innovative in their ability
to keep the network of parked cars under continuous optimization, in their
multi-criteria decision process that can be focused on key network performance
metrics, and in their ability to manage the battery usage of each car, rotating
roadside unit roles between vehicles as required. We also present the first
comprehensive study of the performance of such an approach, via realistic
modeling of mobility, parking, and communication, thorough simulations, and an
experimental verification of concepts that are key to self-organization. Our
analysis brings strong evidence that parked cars can serve as an alternative to
fixed roadside units, and organize to form networks that can support smarter
transportation and mobility
- …